#include <iostream>
#include <string>
#include <cctype>
using namespace std;


int main()
{
   string s;
   getline(cin,s);
   for(auto& e : s)
   {
   	if(e =='a')
   	   e = 'z';
   	else if(e == 'A')
   	   e = 'Z';
   	else if(!isalpha(e));
   	else
   	   e-=1;

   }
   cout << s << endl;
}

